basically i need a mod or some type of way to charge shipping for individual boxes. For example: if a customer buys lets say a box that weighs 10lbs, and he bought another item that weighed 30lbs, it equals 40lbs right? Now the actual shipping charge would have it come out as combined shipping price of 40lbs, i need it to be 10lb shipping price for 1 box, and then 30lb shipping price for the 2nd box.

Any mods or any ideas how i can do this? Please Help me on this!